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1 /*
2 	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
3 	<http://rt2x00.serialmonkey.com>
4 
5 	This program is free software; you can redistribute it and/or modify
6 	it under the terms of the GNU General Public License as published by
7 	the Free Software Foundation; either version 2 of the License, or
8 	(at your option) any later version.
9 
10 	This program is distributed in the hope that it will be useful,
11 	but WITHOUT ANY WARRANTY; without even the implied warranty of
12 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 	GNU General Public License for more details.
14 
15 	You should have received a copy of the GNU General Public License
16 	along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 /*
20 	Module: rt2x00mac
21 	Abstract: rt2x00 generic mac80211 routines.
22  */
23 
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 
27 #include "rt2x00.h"
28 #include "rt2x00lib.h"
29 
rt2x00mac_tx_rts_cts(struct rt2x00_dev * rt2x00dev,struct data_queue * queue,struct sk_buff * frag_skb)30 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
31 				struct data_queue *queue,
32 				struct sk_buff *frag_skb)
33 {
34 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
35 	struct ieee80211_tx_info *rts_info;
36 	struct sk_buff *skb;
37 	unsigned int data_length;
38 	int retval = 0;
39 
40 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
41 		data_length = sizeof(struct ieee80211_cts);
42 	else
43 		data_length = sizeof(struct ieee80211_rts);
44 
45 	skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
46 	if (unlikely(!skb)) {
47 		rt2x00_warn(rt2x00dev, "Failed to create RTS/CTS frame\n");
48 		return -ENOMEM;
49 	}
50 
51 	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
52 	skb_put(skb, data_length);
53 
54 	/*
55 	 * Copy TX information over from original frame to
56 	 * RTS/CTS frame. Note that we set the no encryption flag
57 	 * since we don't want this frame to be encrypted.
58 	 * RTS frames should be acked, while CTS-to-self frames
59 	 * should not. The ready for TX flag is cleared to prevent
60 	 * it being automatically send when the descriptor is
61 	 * written to the hardware.
62 	 */
63 	memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
64 	rts_info = IEEE80211_SKB_CB(skb);
65 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
66 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;
67 
68 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
69 		rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
70 	else
71 		rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;
72 
73 	/* Disable hardware encryption */
74 	rts_info->control.hw_key = NULL;
75 
76 	/*
77 	 * RTS/CTS frame should use the length of the frame plus any
78 	 * encryption overhead that will be added by the hardware.
79 	 */
80 	data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);
81 
82 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
83 		ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
84 					frag_skb->data, data_length, tx_info,
85 					(struct ieee80211_cts *)(skb->data));
86 	else
87 		ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
88 				  frag_skb->data, data_length, tx_info,
89 				  (struct ieee80211_rts *)(skb->data));
90 
91 	retval = rt2x00queue_write_tx_frame(queue, skb, NULL, true);
92 	if (retval) {
93 		dev_kfree_skb_any(skb);
94 		rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
95 	}
96 
97 	return retval;
98 }
99 
rt2x00mac_tx(struct ieee80211_hw * hw,struct ieee80211_tx_control * control,struct sk_buff * skb)100 void rt2x00mac_tx(struct ieee80211_hw *hw,
101 		  struct ieee80211_tx_control *control,
102 		  struct sk_buff *skb)
103 {
104 	struct rt2x00_dev *rt2x00dev = hw->priv;
105 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
106 	enum data_queue_qid qid = skb_get_queue_mapping(skb);
107 	struct data_queue *queue = NULL;
108 
109 	/*
110 	 * Mac80211 might be calling this function while we are trying
111 	 * to remove the device or perhaps suspending it.
112 	 * Note that we can only stop the TX queues inside the TX path
113 	 * due to possible race conditions in mac80211.
114 	 */
115 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
116 		goto exit_free_skb;
117 
118 	/*
119 	 * Use the ATIM queue if appropriate and present.
120 	 */
121 	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
122 	    rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE))
123 		qid = QID_ATIM;
124 
125 	queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
126 	if (unlikely(!queue)) {
127 		rt2x00_err(rt2x00dev,
128 			   "Attempt to send packet over invalid queue %d\n"
129 			   "Please file bug report to %s\n", qid, DRV_PROJECT);
130 		goto exit_free_skb;
131 	}
132 
133 	/*
134 	 * If CTS/RTS is required. create and queue that frame first.
135 	 * Make sure we have at least enough entries available to send
136 	 * this CTS/RTS frame as well as the data frame.
137 	 * Note that when the driver has set the set_rts_threshold()
138 	 * callback function it doesn't need software generation of
139 	 * either RTS or CTS-to-self frame and handles everything
140 	 * inside the hardware.
141 	 */
142 	if (!rt2x00dev->ops->hw->set_rts_threshold &&
143 	    (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
144 						IEEE80211_TX_RC_USE_CTS_PROTECT))) {
145 		if (rt2x00queue_available(queue) <= 1)
146 			goto exit_fail;
147 
148 		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
149 			goto exit_fail;
150 	}
151 
152 	if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
153 		goto exit_fail;
154 
155 	/*
156 	 * Pausing queue has to be serialized with rt2x00lib_txdone(). Note
157 	 * we should not use spin_lock_bh variant as bottom halve was already
158 	 * disabled before ieee80211_xmit() call.
159 	 */
160 	spin_lock(&queue->tx_lock);
161 	if (rt2x00queue_threshold(queue))
162 		rt2x00queue_pause_queue(queue);
163 	spin_unlock(&queue->tx_lock);
164 
165 	return;
166 
167  exit_fail:
168 	spin_lock(&queue->tx_lock);
169 	rt2x00queue_pause_queue(queue);
170 	spin_unlock(&queue->tx_lock);
171  exit_free_skb:
172 	ieee80211_free_txskb(hw, skb);
173 }
174 EXPORT_SYMBOL_GPL(rt2x00mac_tx);
175 
rt2x00mac_start(struct ieee80211_hw * hw)176 int rt2x00mac_start(struct ieee80211_hw *hw)
177 {
178 	struct rt2x00_dev *rt2x00dev = hw->priv;
179 
180 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
181 		return 0;
182 
183 	return rt2x00lib_start(rt2x00dev);
184 }
185 EXPORT_SYMBOL_GPL(rt2x00mac_start);
186 
rt2x00mac_stop(struct ieee80211_hw * hw)187 void rt2x00mac_stop(struct ieee80211_hw *hw)
188 {
189 	struct rt2x00_dev *rt2x00dev = hw->priv;
190 
191 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
192 		return;
193 
194 	rt2x00lib_stop(rt2x00dev);
195 }
196 EXPORT_SYMBOL_GPL(rt2x00mac_stop);
197 
rt2x00mac_add_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)198 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
199 			    struct ieee80211_vif *vif)
200 {
201 	struct rt2x00_dev *rt2x00dev = hw->priv;
202 	struct rt2x00_intf *intf = vif_to_intf(vif);
203 	struct data_queue *queue = rt2x00dev->bcn;
204 	struct queue_entry *entry = NULL;
205 	unsigned int i;
206 
207 	/*
208 	 * Don't allow interfaces to be added
209 	 * the device has disappeared.
210 	 */
211 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
212 	    !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
213 		return -ENODEV;
214 
215 	/*
216 	 * Loop through all beacon queues to find a free
217 	 * entry. Since there are as much beacon entries
218 	 * as the maximum interfaces, this search shouldn't
219 	 * fail.
220 	 */
221 	for (i = 0; i < queue->limit; i++) {
222 		entry = &queue->entries[i];
223 		if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
224 			break;
225 	}
226 
227 	if (unlikely(i == queue->limit))
228 		return -ENOBUFS;
229 
230 	/*
231 	 * We are now absolutely sure the interface can be created,
232 	 * increase interface count and start initialization.
233 	 */
234 
235 	if (vif->type == NL80211_IFTYPE_AP)
236 		rt2x00dev->intf_ap_count++;
237 	else
238 		rt2x00dev->intf_sta_count++;
239 
240 	mutex_init(&intf->beacon_skb_mutex);
241 	intf->beacon = entry;
242 
243 	/*
244 	 * The MAC address must be configured after the device
245 	 * has been initialized. Otherwise the device can reset
246 	 * the MAC registers.
247 	 * The BSSID address must only be configured in AP mode,
248 	 * however we should not send an empty BSSID address for
249 	 * STA interfaces at this time, since this can cause
250 	 * invalid behavior in the device.
251 	 */
252 	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
253 			      vif->addr, NULL);
254 
255 	/*
256 	 * Some filters depend on the current working mode. We can force
257 	 * an update during the next configure_filter() run by mac80211 by
258 	 * resetting the current packet_filter state.
259 	 */
260 	rt2x00dev->packet_filter = 0;
261 
262 	return 0;
263 }
264 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
265 
rt2x00mac_remove_interface(struct ieee80211_hw * hw,struct ieee80211_vif * vif)266 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
267 				struct ieee80211_vif *vif)
268 {
269 	struct rt2x00_dev *rt2x00dev = hw->priv;
270 	struct rt2x00_intf *intf = vif_to_intf(vif);
271 
272 	/*
273 	 * Don't allow interfaces to be remove while
274 	 * either the device has disappeared or when
275 	 * no interface is present.
276 	 */
277 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
278 	    (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
279 	    (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
280 		return;
281 
282 	if (vif->type == NL80211_IFTYPE_AP)
283 		rt2x00dev->intf_ap_count--;
284 	else
285 		rt2x00dev->intf_sta_count--;
286 
287 	/*
288 	 * Release beacon entry so it is available for
289 	 * new interfaces again.
290 	 */
291 	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
292 
293 	/*
294 	 * Make sure the bssid and mac address registers
295 	 * are cleared to prevent false ACKing of frames.
296 	 */
297 	rt2x00lib_config_intf(rt2x00dev, intf,
298 			      NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
299 }
300 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
301 
rt2x00mac_config(struct ieee80211_hw * hw,u32 changed)302 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
303 {
304 	struct rt2x00_dev *rt2x00dev = hw->priv;
305 	struct ieee80211_conf *conf = &hw->conf;
306 
307 	/*
308 	 * mac80211 might be calling this function while we are trying
309 	 * to remove the device or perhaps suspending it.
310 	 */
311 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
312 		return 0;
313 
314 	/*
315 	 * Some configuration parameters (e.g. channel and antenna values) can
316 	 * only be set when the radio is enabled, but do require the RX to
317 	 * be off. During this period we should keep link tuning enabled,
318 	 * if for any reason the link tuner must be reset, this will be
319 	 * handled by rt2x00lib_config().
320 	 */
321 	rt2x00queue_stop_queue(rt2x00dev->rx);
322 
323 	/*
324 	 * When we've just turned on the radio, we want to reprogram
325 	 * everything to ensure a consistent state
326 	 */
327 	rt2x00lib_config(rt2x00dev, conf, changed);
328 
329 	/*
330 	 * After the radio has been enabled we need to configure
331 	 * the antenna to the default settings. rt2x00lib_config_antenna()
332 	 * should determine if any action should be taken based on
333 	 * checking if diversity has been enabled or no antenna changes
334 	 * have been made since the last configuration change.
335 	 */
336 	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);
337 
338 	/* Turn RX back on */
339 	rt2x00queue_start_queue(rt2x00dev->rx);
340 
341 	return 0;
342 }
343 EXPORT_SYMBOL_GPL(rt2x00mac_config);
344 
rt2x00mac_configure_filter(struct ieee80211_hw * hw,unsigned int changed_flags,unsigned int * total_flags,u64 multicast)345 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
346 				unsigned int changed_flags,
347 				unsigned int *total_flags,
348 				u64 multicast)
349 {
350 	struct rt2x00_dev *rt2x00dev = hw->priv;
351 
352 	/*
353 	 * Mask off any flags we are going to ignore
354 	 * from the total_flags field.
355 	 */
356 	*total_flags &=
357 	    FIF_ALLMULTI |
358 	    FIF_FCSFAIL |
359 	    FIF_PLCPFAIL |
360 	    FIF_CONTROL |
361 	    FIF_PSPOLL |
362 	    FIF_OTHER_BSS;
363 
364 	/*
365 	 * Apply some rules to the filters:
366 	 * - Some filters imply different filters to be set.
367 	 * - Some things we can't filter out at all.
368 	 * - Multicast filter seems to kill broadcast traffic so never use it.
369 	 */
370 	*total_flags |= FIF_ALLMULTI;
371 
372 	/*
373 	 * If the device has a single filter for all control frames,
374 	 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
375 	 * And if the device has more than one filter for control frames
376 	 * of different types, but has no a separate filter for PS Poll frames,
377 	 * FIF_CONTROL flag implies FIF_PSPOLL.
378 	 */
379 	if (!rt2x00_has_cap_control_filters(rt2x00dev)) {
380 		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
381 			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
382 	}
383 	if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
384 		if (*total_flags & FIF_CONTROL)
385 			*total_flags |= FIF_PSPOLL;
386 	}
387 
388 	/*
389 	 * Check if there is any work left for us.
390 	 */
391 	if (rt2x00dev->packet_filter == *total_flags)
392 		return;
393 	rt2x00dev->packet_filter = *total_flags;
394 
395 	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
396 }
397 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);
398 
rt2x00mac_set_tim_iter(void * data,u8 * mac,struct ieee80211_vif * vif)399 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
400 				   struct ieee80211_vif *vif)
401 {
402 	struct rt2x00_intf *intf = vif_to_intf(vif);
403 
404 	if (vif->type != NL80211_IFTYPE_AP &&
405 	    vif->type != NL80211_IFTYPE_ADHOC &&
406 	    vif->type != NL80211_IFTYPE_MESH_POINT &&
407 	    vif->type != NL80211_IFTYPE_WDS)
408 		return;
409 
410 	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
411 }
412 
rt2x00mac_set_tim(struct ieee80211_hw * hw,struct ieee80211_sta * sta,bool set)413 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
414 		      bool set)
415 {
416 	struct rt2x00_dev *rt2x00dev = hw->priv;
417 
418 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
419 		return 0;
420 
421 	ieee80211_iterate_active_interfaces_atomic(
422 		rt2x00dev->hw, IEEE80211_IFACE_ITER_RESUME_ALL,
423 		rt2x00mac_set_tim_iter, rt2x00dev);
424 
425 	/* queue work to upodate the beacon template */
426 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
427 	return 0;
428 }
429 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);
430 
431 #ifdef CONFIG_RT2X00_LIB_CRYPTO
memcpy_tkip(struct rt2x00lib_crypto * crypto,u8 * key,u8 key_len)432 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
433 {
434 	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
435 		memcpy(crypto->key,
436 		       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
437 		       sizeof(crypto->key));
438 
439 	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
440 		memcpy(crypto->tx_mic,
441 		       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
442 		       sizeof(crypto->tx_mic));
443 
444 	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
445 		memcpy(crypto->rx_mic,
446 		       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
447 		       sizeof(crypto->rx_mic));
448 }
449 
rt2x00mac_set_key(struct ieee80211_hw * hw,enum set_key_cmd cmd,struct ieee80211_vif * vif,struct ieee80211_sta * sta,struct ieee80211_key_conf * key)450 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
451 		      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
452 		      struct ieee80211_key_conf *key)
453 {
454 	struct rt2x00_dev *rt2x00dev = hw->priv;
455 	int (*set_key) (struct rt2x00_dev *rt2x00dev,
456 			struct rt2x00lib_crypto *crypto,
457 			struct ieee80211_key_conf *key);
458 	struct rt2x00lib_crypto crypto;
459 	static const u8 bcast_addr[ETH_ALEN] =
460 		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };
461 	struct rt2x00_sta *sta_priv = NULL;
462 
463 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
464 		return 0;
465 
466 	if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
467 		return -EOPNOTSUPP;
468 
469 	/*
470 	 * To support IBSS RSN, don't program group keys in IBSS, the
471 	 * hardware will then not attempt to decrypt the frames.
472 	 */
473 	if (vif->type == NL80211_IFTYPE_ADHOC &&
474 	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
475 		return -EOPNOTSUPP;
476 
477 	if (key->keylen > 32)
478 		return -ENOSPC;
479 
480 	memset(&crypto, 0, sizeof(crypto));
481 
482 	crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
483 	crypto.cipher = rt2x00crypto_key_to_cipher(key);
484 	if (crypto.cipher == CIPHER_NONE)
485 		return -EOPNOTSUPP;
486 	if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
487 		return -EOPNOTSUPP;
488 
489 	crypto.cmd = cmd;
490 
491 	if (sta) {
492 		crypto.address = sta->addr;
493 		sta_priv = sta_to_rt2x00_sta(sta);
494 		crypto.wcid = sta_priv->wcid;
495 	} else
496 		crypto.address = bcast_addr;
497 
498 	if (crypto.cipher == CIPHER_TKIP)
499 		memcpy_tkip(&crypto, &key->key[0], key->keylen);
500 	else
501 		memcpy(crypto.key, &key->key[0], key->keylen);
502 	/*
503 	 * Each BSS has a maximum of 4 shared keys.
504 	 * Shared key index values:
505 	 *	0) BSS0 key0
506 	 *	1) BSS0 key1
507 	 *	...
508 	 *	4) BSS1 key0
509 	 *	...
510 	 *	8) BSS2 key0
511 	 *	...
512 	 * Both pairwise as shared key indeces are determined by
513 	 * driver. This is required because the hardware requires
514 	 * keys to be assigned in correct order (When key 1 is
515 	 * provided but key 0 is not, then the key is not found
516 	 * by the hardware during RX).
517 	 */
518 	if (cmd == SET_KEY)
519 		key->hw_key_idx = 0;
520 
521 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
522 		set_key = rt2x00dev->ops->lib->config_pairwise_key;
523 	else
524 		set_key = rt2x00dev->ops->lib->config_shared_key;
525 
526 	if (!set_key)
527 		return -EOPNOTSUPP;
528 
529 	return set_key(rt2x00dev, &crypto, key);
530 }
531 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
532 #endif /* CONFIG_RT2X00_LIB_CRYPTO */
533 
rt2x00mac_sta_add(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta)534 int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
535 		      struct ieee80211_sta *sta)
536 {
537 	struct rt2x00_dev *rt2x00dev = hw->priv;
538 
539 	return rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta);
540 }
541 EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);
542 
rt2x00mac_sta_remove(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_sta * sta)543 int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
544 			 struct ieee80211_sta *sta)
545 {
546 	struct rt2x00_dev *rt2x00dev = hw->priv;
547 	struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
548 
549 	return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
550 }
551 EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);
552 
rt2x00mac_sw_scan_start(struct ieee80211_hw * hw,struct ieee80211_vif * vif,const u8 * mac_addr)553 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
554 			     struct ieee80211_vif *vif,
555 			     const u8 *mac_addr)
556 {
557 	struct rt2x00_dev *rt2x00dev = hw->priv;
558 	set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
559 	rt2x00link_stop_tuner(rt2x00dev);
560 }
561 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);
562 
rt2x00mac_sw_scan_complete(struct ieee80211_hw * hw,struct ieee80211_vif * vif)563 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw,
564 				struct ieee80211_vif *vif)
565 {
566 	struct rt2x00_dev *rt2x00dev = hw->priv;
567 	clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
568 	rt2x00link_start_tuner(rt2x00dev);
569 }
570 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);
571 
rt2x00mac_get_stats(struct ieee80211_hw * hw,struct ieee80211_low_level_stats * stats)572 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
573 			struct ieee80211_low_level_stats *stats)
574 {
575 	struct rt2x00_dev *rt2x00dev = hw->priv;
576 
577 	/*
578 	 * The dot11ACKFailureCount, dot11RTSFailureCount and
579 	 * dot11RTSSuccessCount are updated in interrupt time.
580 	 * dot11FCSErrorCount is updated in the link tuner.
581 	 */
582 	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
583 
584 	return 0;
585 }
586 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
587 
rt2x00mac_bss_info_changed(struct ieee80211_hw * hw,struct ieee80211_vif * vif,struct ieee80211_bss_conf * bss_conf,u32 changes)588 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
589 				struct ieee80211_vif *vif,
590 				struct ieee80211_bss_conf *bss_conf,
591 				u32 changes)
592 {
593 	struct rt2x00_dev *rt2x00dev = hw->priv;
594 	struct rt2x00_intf *intf = vif_to_intf(vif);
595 
596 	/*
597 	 * mac80211 might be calling this function while we are trying
598 	 * to remove the device or perhaps suspending it.
599 	 */
600 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
601 		return;
602 
603 	/*
604 	 * Update the BSSID.
605 	 */
606 	if (changes & BSS_CHANGED_BSSID)
607 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
608 				      bss_conf->bssid);
609 
610 	/*
611 	 * Start/stop beaconing.
612 	 */
613 	if (changes & BSS_CHANGED_BEACON_ENABLED) {
614 		mutex_lock(&intf->beacon_skb_mutex);
615 		if (!bss_conf->enable_beacon && intf->enable_beacon) {
616 			rt2x00dev->intf_beaconing--;
617 			intf->enable_beacon = false;
618 
619 			if (rt2x00dev->intf_beaconing == 0) {
620 				/*
621 				 * Last beaconing interface disabled
622 				 * -> stop beacon queue.
623 				 */
624 				rt2x00queue_stop_queue(rt2x00dev->bcn);
625 			}
626 			/*
627 			 * Clear beacon in the H/W for this vif. This is needed
628 			 * to disable beaconing on this particular interface
629 			 * and keep it running on other interfaces.
630 			 */
631 			rt2x00queue_clear_beacon(rt2x00dev, vif);
632 		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
633 			rt2x00dev->intf_beaconing++;
634 			intf->enable_beacon = true;
635 			/*
636 			 * Upload beacon to the H/W. This is only required on
637 			 * USB devices. PCI devices fetch beacons periodically.
638 			 */
639 			if (rt2x00_is_usb(rt2x00dev))
640 				rt2x00queue_update_beacon(rt2x00dev, vif);
641 
642 			if (rt2x00dev->intf_beaconing == 1) {
643 				/*
644 				 * First beaconing interface enabled
645 				 * -> start beacon queue.
646 				 */
647 				rt2x00queue_start_queue(rt2x00dev->bcn);
648 			}
649 		}
650 		mutex_unlock(&intf->beacon_skb_mutex);
651 	}
652 
653 	/*
654 	 * When the association status has changed we must reset the link
655 	 * tuner counter. This is because some drivers determine if they
656 	 * should perform link tuning based on the number of seconds
657 	 * while associated or not associated.
658 	 */
659 	if (changes & BSS_CHANGED_ASSOC) {
660 		rt2x00dev->link.count = 0;
661 
662 		if (bss_conf->assoc)
663 			rt2x00dev->intf_associated++;
664 		else
665 			rt2x00dev->intf_associated--;
666 
667 		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
668 
669 		clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
670 	}
671 
672 	/*
673 	 * Check for access point which do not support 802.11e . We have to
674 	 * generate data frames sequence number in S/W for such AP, because
675 	 * of H/W bug.
676 	 */
677 	if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
678 		set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
679 
680 	/*
681 	 * When the erp information has changed, we should perform
682 	 * additional configuration steps. For all other changes we are done.
683 	 */
684 	if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
685 		       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
686 		       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
687 		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
688 }
689 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
690 
rt2x00mac_conf_tx(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u16 queue_idx,const struct ieee80211_tx_queue_params * params)691 int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
692 		      struct ieee80211_vif *vif, u16 queue_idx,
693 		      const struct ieee80211_tx_queue_params *params)
694 {
695 	struct rt2x00_dev *rt2x00dev = hw->priv;
696 	struct data_queue *queue;
697 
698 	queue = rt2x00queue_get_tx_queue(rt2x00dev, queue_idx);
699 	if (unlikely(!queue))
700 		return -EINVAL;
701 
702 	/*
703 	 * The passed variables are stored as real value ((2^n)-1).
704 	 * Ralink registers require to know the bit number 'n'.
705 	 */
706 	if (params->cw_min > 0)
707 		queue->cw_min = fls(params->cw_min);
708 	else
709 		queue->cw_min = 5; /* cw_min: 2^5 = 32. */
710 
711 	if (params->cw_max > 0)
712 		queue->cw_max = fls(params->cw_max);
713 	else
714 		queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
715 
716 	queue->aifs = params->aifs;
717 	queue->txop = params->txop;
718 
719 	rt2x00_dbg(rt2x00dev,
720 		   "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d\n",
721 		   queue_idx, queue->cw_min, queue->cw_max, queue->aifs,
722 		   queue->txop);
723 
724 	return 0;
725 }
726 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
727 
rt2x00mac_rfkill_poll(struct ieee80211_hw * hw)728 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
729 {
730 	struct rt2x00_dev *rt2x00dev = hw->priv;
731 	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);
732 
733 	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
734 }
735 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
736 
rt2x00mac_flush(struct ieee80211_hw * hw,struct ieee80211_vif * vif,u32 queues,bool drop)737 void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
738 		     u32 queues, bool drop)
739 {
740 	struct rt2x00_dev *rt2x00dev = hw->priv;
741 	struct data_queue *queue;
742 
743 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
744 		return;
745 
746 	tx_queue_for_each(rt2x00dev, queue)
747 		rt2x00queue_flush_queue(queue, drop);
748 }
749 EXPORT_SYMBOL_GPL(rt2x00mac_flush);
750 
rt2x00mac_set_antenna(struct ieee80211_hw * hw,u32 tx_ant,u32 rx_ant)751 int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
752 {
753 	struct rt2x00_dev *rt2x00dev = hw->priv;
754 	struct link_ant *ant = &rt2x00dev->link.ant;
755 	struct antenna_setup *def = &rt2x00dev->default_ant;
756 	struct antenna_setup setup;
757 
758 	// The antenna value is not supposed to be 0,
759 	// or exceed the maximum number of antenna's.
760 	if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
761 		return -EINVAL;
762 
763 	// When the client tried to configure the antenna to or from
764 	// diversity mode, we must reset the default antenna as well
765 	// as that controls the diversity switch.
766 	if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
767 		ant->flags &= ~ANTENNA_TX_DIVERSITY;
768 	if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
769 		ant->flags &= ~ANTENNA_RX_DIVERSITY;
770 
771 	// If diversity is being enabled, check if we need hardware
772 	// or software diversity. In the latter case, reset the value,
773 	// and make sure we update the antenna flags to have the
774 	// link tuner pick up the diversity tuning.
775 	if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
776 		tx_ant = ANTENNA_SW_DIVERSITY;
777 		ant->flags |= ANTENNA_TX_DIVERSITY;
778 	}
779 
780 	if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
781 		rx_ant = ANTENNA_SW_DIVERSITY;
782 		ant->flags |= ANTENNA_RX_DIVERSITY;
783 	}
784 
785 	setup.tx = tx_ant;
786 	setup.rx = rx_ant;
787 	setup.rx_chain_num = 0;
788 	setup.tx_chain_num = 0;
789 
790 	rt2x00lib_config_antenna(rt2x00dev, setup);
791 
792 	return 0;
793 }
794 EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
795 
rt2x00mac_get_antenna(struct ieee80211_hw * hw,u32 * tx_ant,u32 * rx_ant)796 int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
797 {
798 	struct rt2x00_dev *rt2x00dev = hw->priv;
799 	struct link_ant *ant = &rt2x00dev->link.ant;
800 	struct antenna_setup *active = &rt2x00dev->link.ant.active;
801 
802 	// When software diversity is active, we must report this to the
803 	// client and not the current active antenna state.
804 	if (ant->flags & ANTENNA_TX_DIVERSITY)
805 		*tx_ant = ANTENNA_HW_DIVERSITY;
806 	else
807 		*tx_ant = active->tx;
808 
809 	if (ant->flags & ANTENNA_RX_DIVERSITY)
810 		*rx_ant = ANTENNA_HW_DIVERSITY;
811 	else
812 		*rx_ant = active->rx;
813 
814 	return 0;
815 }
816 EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
817 
rt2x00mac_get_ringparam(struct ieee80211_hw * hw,u32 * tx,u32 * tx_max,u32 * rx,u32 * rx_max)818 void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
819 			     u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
820 {
821 	struct rt2x00_dev *rt2x00dev = hw->priv;
822 	struct data_queue *queue;
823 
824 	tx_queue_for_each(rt2x00dev, queue) {
825 		*tx += queue->length;
826 		*tx_max += queue->limit;
827 	}
828 
829 	*rx = rt2x00dev->rx->length;
830 	*rx_max = rt2x00dev->rx->limit;
831 }
832 EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
833 
rt2x00mac_tx_frames_pending(struct ieee80211_hw * hw)834 bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
835 {
836 	struct rt2x00_dev *rt2x00dev = hw->priv;
837 	struct data_queue *queue;
838 
839 	tx_queue_for_each(rt2x00dev, queue) {
840 		if (!rt2x00queue_empty(queue))
841 			return true;
842 	}
843 
844 	return false;
845 }
846 EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);
847